UKMi Q&A xx - SPS

The TSH reference interval will vary depending on the testing laboratory. Laboratories in BC retain specimens for 2 to 7 days in case add-on testing is required. If TSH is ordered initially in combination with fT4 or fT3, the laboratory will perform the TSH test first and then perform the fT4 and fT3 if required, as described in Appendix 1 (see ................
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